Philips Sonicare' s Best brush head Value Edition Reminder bristles fade when replacement is needed Dentists recommend replacement every 3 months for optimal results Our Lowest Priced brush head pack The Philips Sonicare SimplyClean "Value Edition" are snap-on replacement brush heads designed to work with multiple Sonicare models. Reminder bristles fade to let you know when it's time for replacement. Replace your brush head every 3 months as recommended by the American Dental Association. A fresh brush head every 3 months maximizes the effectiveness of Philips unique Sonicare technology. Essential Oil Warning: Toothpaste containing essential oils can damage your brush head. Avoid direct contact with products that contain essential oils or coconut oil. Use may result in bristle tufts dislodging.